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Pension and Other Post-retirement Benefits Net Periodic Pension Costs and Weighted Average Assumptions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Interest cost $ 31.0 $ 29.8 $ 31.2
Expected return on plan assets (29.4) (31.6) (31.4)
Amortization of net gain (0.7) (0.6) (0.7)
Net periodic pension costs $ 0.9 $ (2.4) $ (0.9)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 6.44% 6.88% 7.10%
Cash balance interest credit rate 3.26% 3.26% 3.23%
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost $ 30.5 $ 29.3  
Discount rate 5.54% 4.97% 5.21%